1666292463349 has 2 divisors, whose sum is σ = 1666292463350. Its totient is φ = 1666292463348.

The previous prime is 1666292463343. The next prime is 1666292463371. The reversal of 1666292463349 is 9433642926661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1514885871249 + 151406592100 = 1230807^2 + 389110^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666292463349 - 2⁷ = 1666292463221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666292463343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833146231674 + 833146231675.

It is an arithmetic number, because the mean of its divisors is an integer number (833146231675).

Almost surely, 2^{1666292463349} is an apocalyptic number.

It is an amenable number.

1666292463349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666292463349 is an equidigital number, since it uses as much as digits as its factorization.

1666292463349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60466176, while the sum is 61.

The spelling of 1666292463349 in words is "one trillion, six hundred sixty-six billion, two hundred ninety-two million, four hundred sixty-three thousand, three hundred forty-nine".